Email marketing is a considerable development and includes direct emails, transactional emails, and email newsletters to attract new customers and retain existing ones. This research paper aims to identify and synthesize literature on the effectiveness of email marketing and potential challenges affecting its proper implementation. The research establishes that businesses in the current business environment recognize email marketing's capacity to produce a higher return on investment and generate more sales than traditional marketing channels, such as television. The adoption of permission-based email marketing enables establishing strong relationships between companies and their target audiences, developing emotional, conative, and cognitive responses to the distributed messages. Therefore, salespersons should ensure compliance with legal requirements in email marketing and develop effective strategies of reducing spam emails to avoid negative impressions and increase response rates.